M. Bouchon et al., Seismic imaging of the 1999 Izmit (Turkey) rupture inferred from the near-fault recordings, GEOPHYS R L, 27(18), 2000, pp. 3013-3016
We use near-fault accelerograms to infer the space-time history of rupture
on the fault during the Izmit earthquake. The records show that the ground
displacement and velocity near the fault were surprisingly simple. Rupture
propagated toward the west at a velocity of about 3 km/s, and toward the ea
st at a remarkably high average velocity of 4.7 km/s over a distance of abo
ut 45 km before decelerating to about 3.1 km/s on the eastern segment. Slip
on the fault is particularly large down to a depth of 20 km on the central
portion of the fault where it reaches about 7 m. Slip is large also below
10 km on the eastern fault segment, and this may have contributed to the lo
ading of shear stress on the Duzce fault. On the western fault segment, lar
ge slip seems confined to shallow depths.